Hydrogen vs batteries

A battery stores electricity directly and returns most of it. Hydrogen converts electricity into a gas, compresses it, then converts it back — losing a large share along the way.

Hydrogen's advantage is weight and refuelling time. For long-haul transport, heavy industry, shipping and seasonal storage, those advantages can outweigh the efficiency penalty.

For a passenger car charged at home from your own solar, the battery wins on efficiency, cost and infrastructure by a wide margin.